【題目】____________he’ll be able to come is not yet known.

A.ThatB.IfC.WhetherD.What

【答案】C

【解析】

考查主語(yǔ)從句。句意:他是否能來還不知道。根據(jù)is not yet known可知,此處是主語(yǔ)從句,連接詞在從句中表示“是否”,應(yīng)使用whether引導(dǎo),if不能引導(dǎo)主語(yǔ)從句。故選C。

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